package main

import "fmt"

func main()  {
	a:=9
	b:=4
	sum:=a+b
	sub:=a-b
	mul:=a*b
	div:=a/b
	fmt.Println("a+b=:",sum)
	fmt.Println("a-b=:",sub)
	fmt.Println("a*b=:",mul)
	fmt.Println("a/b=:",div) //0不能除

	mod:=a%b
	fmt.Println(mod)
	fmt.Println("a的数值：",a)
	a++
	fmt.Println(a)
	a--
	fmt.Println(a)
}